Support and sound-duct for sound-boxes.



, T. H. MACDONALD. surom AND soUnD Duo'rro soUND Bons.

APPLIGATIoy-HLED In 14,r 1910. p

Patented Apr. 30, 1912.

UNITED STATES PATENT oEEIoE.

THOMAS H. MACDONALD, OF BRIDGEPORT, CONNECTICUT, ASSIGNOR TO AMERICANGRAPHOPHONE COMPANY, 0F BRIDGEPOR'T, CONNECTICUT, A- CORPORATION OIE'WEST VIRGINIA.

Specification of Letters Patent.

' .Patented Apr, `3()` j Q1 n application filed May 14, 1910. Serial No.561,312.

To @Zwhom fit may concern:

Beit known that I, THOMAS H.MAcnoN- ALD, a citizen .of the UnitedStates,and resichines, and is especially adapted for use.

with the so-called Grafonola or graphophone inclosed wit-hin a cabinetwhich conceals its horn, though of course it can be used with othertypes.

The invention consists of the construction and arrangement of parts, andwill be vbest understood by reference to the annexed drawings in which-`Figure 1 is a side View, partly in vertical section of a tone armembodying my inver.- tionand applied to a Grrafonola;I Fig. 2 is a topview of the same, partly in horizontal section; and Fig, 3 is atransverse section, viewed from the right, through lines 3-3 "of Fig. 1.

1 is the base-plate (of the Grafonola, or other type oftalking-machine).

2 represents the turn-tablel and disk?l sound-record thereon. 1

ters the horizonta slot 7 in the member 5,.,

to permit limited )lay of the elbow upon a vertical axis. The upper(horizontal) end of the elbow-member 5 has a flaring mouth ofhemispherical oi tline. Seatedtherein is the ring 8, whose outer surfaceis correspondingly convexei to fit the concave mouth ot' member 5. Thering 8 is pivoted within its seat in mimber 5,v by means of thehorizontal screw-pins 9 9, whose inner ends furnish the jourials for thering 8.

The tapering tone-arm proper 10 has near its larger end a shoulder 11,beyond which 1s the ,cylindrical bearing-surface that journals 'orswivels withinv the bore of ring 8. A pin 12, secured in ring 8,preferably depending from the top thereof, extends into an annular'groove or slot 13 i-n the adjacent portion of tone-arm 10, to permitlimited axial turning of the tone-arm Within ring 8. f

The sound-box .14 may, if desired, be. made integral with the tone-arm;and it carries the usual stylus-bar for the reproducing-needle 15, whichco-acts with the record on turn-table 2, in the well known manner. v 16is a screw located in the lower part of the elbow-member 5, and enters alongitudinal. slot 17 in the'adjacent portion of ring 8 and of tone-armv10. This engagement prevents tone-arm 10'v from tippingaxially; but byswinging the tone-arm and. soundbox upward (upon bearings 9 9), 'theirslots are disengaged from pin 16, after which the tone-armcan vbe turnedaxially,

journaling in ring 8, so as to bring needlel5 uppermost for readyremoval.

In, the position shown in Figs. 1 and 2, y

the tone-arm 10 and its sound-box can swing freely in the horizontalplane, but the diaphragm of the sound-box cannot be tipped out of itsvertical plane.

When, however, thev tone-arm is'swung up (on bearings 9-9), it may thenbe turned axially;l whereupon the pin 16 abuts, as a stop', against theinner end of the tone-arm, and holds the same securely away from therecord. p'

I have described my invention with some particularity, but only for thesake of clearness, since parts may be used to the exclusion of otherparts, modifications ofl construction and arrangement mlght be resortedto, the device might be used with-some other type of talking-machinethan the Grafonola, and other modifications might be made withoutldeparting from the spirit of my invention.

Having thus described claim 1. The combination with the sound-box of atalking-machine, of a supportand soundduct therefor comprising a tubularmember journaling in ai'ixed bearing, a second tubumy invention, I

